@grishka good! And a few remaks ;)
- SimpleDateFormat is not thread-safe, you can use ThreadLocal<DateFormat>
- to parse ISO8601 you can use the java.time.OffsetDateTime class
- you use threads, but if an exception will be thrown you never notice about it. You can catch the exception like this ```public void run { try { ... } catch(Exception e) {...}}```
- don't ignore the exception, you can log the exception
- don't use the printStacktrace method, you can use the logger (i. e. slf4j).